“I felt like I was being punked or something, because all the guys are really good looking and had really good jobs,” explains Lauren Garzon, a 32-year old hotel manager in NYC.

With around half a million users sending 200,000 messages per day, it’s growing about 15% every week, Wolfe claims. While Bumble has not yet monetized and won’t disclose the details of its funding, Wolfe’s partner and major funder is Andrey Andreev, founder of Badoo, the multi-billion dollar European social network.

Their Austin-based office has only six employees—and five of them are women.

“Guys found it to be ‘desperate,’ when it wasn’t desperate, it was part of a broken system.” Like many startup founders, Wolfe has big ambitions for the service: “It’s not a dating app, it’s a movement,” she says.

“This could change the way women and men treat each other, women and men date, and women feel about themselves.” Bumble launched about six months ago and seems to be catching on.

A former member of Kappa at Southern Methodist University, Wolfe shows up at sororities with yellow balloons, cartons of yellow Hanky-Panky lacy underwear, and always, she says, “a cute purse.” Then she hands out a thong to each sorority sister who sends out 10 invitations to Bumble.

“By the end, I’d show up and they’d be like ‘Go away, we’re already all on it! Because of the female-first messaging model, Bumble seems to be free of some of the sleaziness that plagues Tinder, at least for now.

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“It’s important to me that nothing we do harms Tinder,” she says. It’s my baby.” But that doesn’t mean she’s not using similar tactics to get it off the ground.

One of Wolfe’s major contributions to Tinder was her ability to get college students to download the app.

But there’s one essential difference: on Bumble, only women can send a message first.